\SQUARE{5}\sol The \texttt{\textbackslash sol} command contains the square of $5$: \[5^2=\sol\] \begin{center} \SQUAREROOT{5}\sol Now, the \texttt{\textbackslash sol} command is the square root of $5$: \[\sqrt{5}=\sol\] \end{center} On having gone out of the \texttt{center} environment, the command recovers its previous value: \sol